Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

CEH's River Lambourn Observatory

998 views

Published on

A presentation by Dr Gareth Old of the Centre for Ecology & Hydrology (CEH) on monitoring work at the CEH River Lambourn Observatory and research into chalk river systems.

Published in: Science
  • Be the first to comment

  • Be the first to like this

CEH's River Lambourn Observatory

  1. 1. CEH RIVER LAMBOURN OBSERVATORY Dr Gareth Old A. House, C. Stratford, C. Roberts, J. Sorensen, D. Gooddy, A. Newell, B. Marchant, O. Mountford, P. Scarlett, R. Ponnambalam, P. Williams and J. Chambers
  2. 2. CHALK STREAMS • High quality designated habitat; diverse ecology • Stable flows, clear waters, constant temperature, and low nutrients/sediments • Long time ago very different! • Current chalk streams are heavily modified • Return to pristine landscape not possible • Management is a challenge
  3. 3. Monthly Flow Values, Boxford 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Jul 08 Aug 08 Sept 08 Oct 08 Nov 08 Dec 08 Jan 09 Feb 09 Mar 09 Apr 09 May 09 Jun 09 Cumec Winter Period Peak flow BOXFORD FLOW REGIME
  4. 4. Widespread agricultural systems: 18th C Managed water levels (SW and GW) : soil moisture, temp. and fertility Widespread abandonment in 20th C Many now recognised as important GDE’s Concern in WFD - vulnerable to environmental change Many are now degrading: restore/conserve WATER MEADOWS
  5. 5. BOXFORD WATER MEADOW
  6. 6. • Desmoulin’s whorl snail • MG8 veg community Designated SSSI and SAC Condition assessment: “Scrub is beginning to encroach … will need to be addressed shortly to … avoid site becoming unfavourable”. Natural England July 2008
  7. 7. RESEARCH: HYDROLOGICAL FUNCTIONING • Survey and monitor to model the site – Developed new non-invasive techniques – Conceptual and numerical • Inform management, monitoring and enable assessment of scenarios
  8. 8. TOPOGRAPHY
  9. 9. SUBSURFACE GEOLOGY Manual probing Borehole logs Electro resistivity tomography
  10. 10. METEOROLOGICAL INPUTS
  11. 11. GROUNDWATER INPUTS Temperature and chemistry
  12. 12. GROUNDWATER INPUTS
  13. 13. INFLUENCE OF THE RIVER
  14. 14. RIVER DISCHARGE
  15. 15. GROUNDWATER LEVELS
  16. 16. GROUNDWATER LEVELS
  17. 17. CONCLUDING REMARKS CEH River Lambourn Observatory Monitoring and surveying • Non-invasive, low cost and rapid • Information versus investment • Conceptual and numeric model development Test scenarios Results and methods: applicable to other sites

×